Water Crossword Puzzle

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Across
  1. 3. pollutants that enter in the ground
  2. 4. a large natural or artificial lake
  3. 6. infectious agent
  4. 9. comes from many different sources
  5. 13. reefs are limestone ridges
  6. 15. an area in which freshwater mixes
  7. 16. barrier constructed to hold back water
  8. 17. are a diverse group of organisms
  9. 18. when the temperature increases
  10. 20. water that contains waste
  11. 22. the introduction of chemical, physical
Down
  1. 1. artificial application of water
  2. 2. the process of removing dissolved salts
  3. 5. successive levels of the food chain
  4. 7. safe to drink
  5. 8. caused by humans
  6. 10. pollution discharged from a single source
  7. 11. the state or quality of a material
  8. 12. water on the surface
  9. 14. where water moves downward
  10. 19. measure of how much of a rock is open space
  11. 21. an underground layer of water